Line marker



March 8, 1966 I H. c. SWEET 3,239,147

1.1m mama Filed Feb. 24, 1964 2 Sheets-Sheet 1 O INVENTOR. HAROLD C.SWEET ATTORNEYS March 8, 1966 H. 0. SWEET 3,239,147

LINE MARKER Filed Feb. 24. 1964 2 Sheets-Sheet 2 8 4 I @Wi I weINVENTOR. HAROLD C. SWEET ATTORNEYS United States Patent 3,239,147 LINEMARKER Harold C. Sweet, 56861 Grand River Ave., New Hudson, Mich. FiledFeb. 24, 1964, Ser. No. 346,947 17 Claims. (Cl. 239-150) This inventionrelates to line marking equipment and more particularly to deviceswherein marking liquid is sprayed uniformly in a continuous line ontothe ground or other surface from a vehicle adapted to be pushed alongthe surface to be marked.

Many vehicles of this kind have heretofore been provided or suggestedwherein a reservoir of marking fluid is supported on a frame havingwheels along its lower section and a handle at its upper end. A maskingdevice and/ or nozzle is provided forward of the frame and suit ablysprays and masks the marking fluid.

The present invention is a line marking machine generally of this typebut includes several novel and important improvements over these priordevices.

It is an objectt of the present invention to provide a line markingdevice of this kind wherein the masking device is easily andconveniently adjustable for various line widths.

Another object of the present invention is to provide a line markingdevice of this kind which is readily and easily disassembled, leaving aconventional hand truck.

Another object is to provide a spray handle and rod in such a devicewhich is easily removed for independent hand spraying of paint,insecticides or any other similar material.

Still another object is to provide a device of this kind which isnormally fixed to produce a uniform straight or curved line andincluding adjusting means for regulating the desired radius of curvatureof the produced line.

Another object is to provide a device having means for supporting anextra reservoir of fluid and also means preventing the extra reservoirfrom accidentally falling off the device.

Yet another object is to provide a well adjacent the end of the spraynozzle accommodating the nozzle when the latter is not in use so as toprevent clogging of the nozzle passage.

Other objects and advantages of the present invention will be morereadily apparent from the following detailed description of preferredembodiments thereof. The description makes reference to the drawings inwhich FIG. 1 is a plan view of the present line marking device in itsoperating position;

FIG. 2 is a perspective view of the present device in operatingposition, shown without its supply can;

FIG. 3 is a side view of the device inits raised position;

FIG. 4 is a fragmentary front end view of the carriage showing variouspositions of the masks in phantom;

FIG. 5 is a fragmentary cross-sectional view taken along the lines 5-5of FIG. 4;

FIG. 6 is a side view of the device in parked position;

FIG. 7 is a fragmentary detail side view showing the retaining means forthe liquid tank;

FIG. 8 is a fragmentary view of the hinged connection between the truckand the spray member;

FIG. 9 is a fragmentary perspective view of a modified form of thecarriage and spraying assembly; and

FIG. 10 is a fragmentary enlarged view of the valve assembly mounted inplace on the spraying assembly.

Referring to the drawings in detail, the line marking device of thepresent invention generally comprises a truck member 10, a spray member12 pivotally connected to the truck member, a tank or reservoir ofmarking liquid 14, and a valved spraying assembly, generally indicatedat 16.

3,239,147 Patented Mar. 8, 1966 The truck member 10 comprises a pair oftubular metal side members or arms 18 and 20 fixed at opposite ends ofthe rear edge of a rectangular metal platform 22. The side membersextend upwardly from the platform in a parallel manner and then convergetogether at their upper ends as indicated at 24. A horizontal bar 26 iswelded to the upper end 24 of the side members 18 and 20, and isprovided with rubber handles 28. A series of parallel supporting strips30 extend horizontally between the rear faces of the arms 18 and 20 atspaced points. A vertical strip 31 extends between the uppermost andlowermost strips 30 and is welded to their rear faces.

A pair of small spaced-apart parallel plates 32 are welded to the outerface of the arm 20 adjacent its upper end. These small plates 32 includealigned holes through which cotter pin 34 is removably disposed. Thecotter pin 34 passes through a similar hole at the end of an elongatedactuating lever 36 whihc projects horizontally from the arm.

Each arm or side member 18 and 20 is provided with a small rcarwardlyprojecting bracket 38 at a point substantially midway along its length.Each bracket 38 includes holes 40 therethrough as shown in FIG. 8. Alarge trapezoidal metal panel 42 is fixed to the lower portion of eachside member 18 and 20 and projects rearwardly therefrom. A shaft 44extends between the panels 42 and is fixed in a hole in each of thesemembers. A wheel 46 fits on each end of the shaft 44 where it projectsthrough the panel 42. A nut 48 retains the wheel rotatably in place onthe shaft.

The shaft 44 is situated at such a distance above the plane of theplatform 22 that the wheels 46 contact the ground or other supportingsurface at all times except when the truck member 10 is disposed withits side members 18 and 20 in a vertical position as shown in FIG. 6.When the truck member 10 is in this last parking position, the platform22 contacts the ground, thus suspending the wheels 46 off the ground.The platform thus acts as a type of brake in this position.

A can of marking liquid 14 is removably mounted on the rear of the truckmember 10. As shown in FIG. 7, this can includes an upper annular lip50, a lower annular projecting flange 52, a rotatable axially movablepressure handle 54, and an outlet tube 56. An L-shaped bracket 58 iswelded to the rear of the vertical strip 31 below the uppermosthorizontal strip 30. The rearwardly projecting leg of the bracket 58 isprovided with a bolt 60 projecting upwardly. An L-shaped clip 62 isprovided with a hole in one of its legs which fits over the bolt 60. Theother leg of the clip 62 fits around the lip 50 so as to retain the can14 in place. A hairpin cotter 64 fits through a hole in the pin 60 andthereby locks the entire assembly together. A clip 66 is fixed to thevertical strip 31 adjacent the lowermost horizontal strip 30 andprojects upwardly. This clip fits around the lower flange 52 on the can14 so as to retain the lower end of the can in place.

The spray member 12 comprises a tubular fork member 68 having a collarportion 70, and diverging arms 72 and 74. Caps 76 at the ends of thearms 72 and 74 seal them against dirt and other undesirable elements.Each arm includes an inwardly projecting pin 78 adapted to fit in thehole 40 of the bracket 38 as illustrated in FIG. 8. The fork 68 isconstructed such that the normal or relaxed distance between the pins 78is less than the distance between the holes 40. Thus the arms 72 and 74must be spread apart in order to be mounted on the brackets 38. Theresulting tension in the fork causes the arms 72 and 74 to fit tightlyagainst the side members 18 and 20 with the pins 78 in pivoting positionin the holes 40.

The spray member 12 also includes a carriage 80 pivotably connected tothe collar portion 70 of the fork member 68. The carriage is comprisedof a masking assembly 82 having a wheel 84 mounted at its rearward end.The masking assembly includes a horizontal elongated rectangular plate86 having a pair of small pins 88 and 90 welded to its lower face so asto project on both long edges of the plate. The ends 92 of the forwardpin 88 are bent slightly upwardly. The ends 94 of the second pin 90 arebent slightly rearwardly.

An L-shaped wheel support 96 is welded to the upper face of the rearwardend of the plate 86. The wheel 84 is held in place on the wheel supportby means of bolt 98 and nut 100 on a shaft 101 passing through the wheeland a hole in the wheel support 96. A carriage ar-m 102, in the form ofa short section of tubing, is welded to the mid-portion of upper face ofthe plate 86. A bolt 104 passes vertically through the collar portion 70of the fork member 68, through the arm 102, and the plate 86. A nut 106is threaded on the lower end of the bolt 104 and holds the entireassembly together. A small cup or tube 108 is welded on the upper faceof the plate 86 forward of the carriage arm 102, just above a spray hole110 in the plate 86. The cup 108 is inclined forward slightly.

A pair of mask supports 112 and 114 are mounted along opposite edges ofthe plate 86 on the pins 88 and 90. Each mask support 112 and 114consists of an L-shaped plate 116 having a retaining flap 118 welded andbent into position at one end thereof. A plurality of holes 120 areprovided in the short leg of the plate 116. A circular hole 122 isprovided adjacent the upper edge of the longer leg of the plate 116 andan elongated slot 124 is provided at the opposite end of this leg;

A mask 126 mounted on each mask support 112 and 114 takes the form of aflat plate having rounded lower corners 128. One upper corner of themask 126 fits slidingly under the flap 118 and includes a flange 130 atits upper edge which acts as a stop in preventing the mask from slidingpast the flap. A screw 132, which passes through an elongated slot 134in the mask 126, passes through the mask support 112 and 114 and islocked rigidly in place by means of a nut 136. The mask 126 is thus heldin place in the support 112 and 114; the screw 132 and flap 118 permitvertical sliding movement of the mask with respect to the support. Thus,when the masks and supports are in place in the device, the masks willaccommodate to rocks, uneven ground or other obstacles by slidingvertically in their supports.

The mask support 114 also includes a well or cup 138 which is welded tothe outer face of the long leg of the plate 116 in an inclined position,similar to that of the cup 108 on the plate 86.

Each mask support 112 and 114 is mounted on the pins 88 and 90 with therearwardly bent ends 94 projecting through the holes 122, and theupwardly bent ends 92 extending through the slots 124. In this mannerthe short legs of the plates 116 lie across one ani other. The masksupports 112 and 114 are pivotable on the pins 88 and 90 in thedirection of the extension of the pins. The holes 120 in the plates 116are so disposed that ditferent holes in the two plates become alignedwhen the angle of inclination of the plates is varied in this manner.The mask supports 112 and 114 may therefore be pivoted in this manneruntil the distance between their lower edges is equal to the desiredwidth of the line to be marked. When the desired position of thesupports 112 and 114 is attained, a locking pin 140 is placed in thealigned holes 120, thus locking the supports against further movement.

The arm 72 of the fork member 68 includes a small projection 142supporting a short tubular section 144. A second short tubular section146 is fixed to the upper surface of the carriage arm 102 by means of abolt and cotter pin 147 and is threaded along its interior length. Aturning crank 148, having a bent handle section 150 at its upper end isjournaled in the tubular section 144 and is threaded at its lower end soas to engage the threads in the the tubular section 146. Rotation of thecrank 148 thus causes the carriage arm to pivot about the bolt 104,thereby producing a rotational movement of the entire carriage about thebolt 104. The position of the crank 148 thus controls the orientation ofthe front wheel 84, and hence controls the direction of movement of theentire device when it is pushed forward.

The spraying assembly 16 is comprised of a metal spray rod 152 having amanual valve assembly 154 at one end as shown in FIG. 10. A pivotallymounted valve handle 156 is adapted to open the valve when it is pivotedupwardly. The inlet 158 to the valve assembly 154 is connected by meansof a rubber hose 160 to the outlet tube 56 on the can 14.

A small plate 162 welded to the arm 74 of the fork member 68 is providedwith a bolt 164 and a stop 166. A clip 168 extends about the bolt 164and the valve assembly 154 and thereby secures the latter in place. Thestop 166 resists upward pivoting of the valve assembly 154 and clip 168about the bolt 164.

A pair of parallel teeth or prongs 170 project downwardly from the lowersurface of the handle 156. A connecting rod 172 extends between theactuating lever 36 and the handle 156. The upper end of the rod 172 ishooked and is held pivotally in the lever 36 by means of a cotter pin174. The lower end of the rod is also hooked and extends about the valveassembly 154 be tween the prongs 170. Upward movement of the lever 36thus induces an upward movement of the handle 156, thereby opening thevalve so as to permit the marking liquid to flow into the spray rod1.52.

The lower end of the spray rod 152 is bent at right angles andterminates in a spray nozzle 176. The pin mounting of the valve assembly154 on the arm 74 permits a limited pivoting movement of the spray rod152. Thus the spray rod may be shifted between positions where thenozzle 176 rests in the cup 108 or in the well 138. When the nozzle isin the cup 108, actuation of the lever 36 causes marking liquid to flowthrough the nozzle 176 onto the ground or other surface between themasks 126.

The present line marking device has three positions for storage and use.In the first or parking position, as shown in FIG. 6, the truck member10 is vertical, and the platform 22 rests upon the ground with thewheels 46 suspended thereabove. The platform then acts as a kind ofbrake device.

The second position is that shown in FIG. 2. This is the actuatingposition in which the marking liquid is sprayed onto the ground or othersurface. In this position, the wheels 46 rest on the ground with theplatform 22 disposed above. The truck member 10 is inclined at an anglefrom the vertical. To operate the device in this position, the can 14 isfirst connected to the valve assembly 154 and then is pressurized bypumping the pressure handle 54. The crank 148 is then rotated until thedevice rolls along the ground on a path having the desired degree ofcurvature. The device is brought to the point where the marking is tobegin, the lever 36 is actuated and the device rolled forward. When theapparatus is to be parked for some period of time, the nozzle of thespray rod 152 is raised out of the spray hole 110 and is placed in thewell 138, which is normally filled with Water or other suitable solvent.This prevents clogging of the nozzle when the marking liquid is notflowing through the device.

The third position of the device is shown in FIG. 3 wherein the truckmember 10 is inclined further towards the horizontal. The front edge ofthe platform 22 strikes the arms 72 and 74 of the fork member 68 andraises the latter member above its normal position. The front wheel 84is thereby raised off the ground. The device is easily turned about whenit is thus supported solely on its rear wheels 46.

The platform 22 serves as a storage shelf for an extra or supply can 178of marking liquid. The arms 72 and 74 of the fork member 68 convergetowards the front of the device. As a result, the supply can 178 isprevented from falling forward off the device; the can may only beremoved in the vertical direction parallel to the side members 18 and20.

FIG. 9 shows an alternative embodiment of the spray member 12. A tube180 is welded to the front end of the plate 86. A second and third tube182 telescope within opposite ends of the first tube 186. A mask supportand mask assembly 184 similar to that shown with respect to the firstembodiment of the invention is welded to the center of the tube 180 andat the end of the second and third tubes 182 at which it is supported onwheels 186. The first tube is provided with a pair of holes 188, and thesecond and third tubes with a series of spaced similar holes 190therethrough which are aligned with the first hole when the second andthird tubes are moved to diflerent positions in the first tube. Ahairpin cotter 192 passes through the holes 188 and 190 when they arealigned. The second and third tubes 182 may be thus positioned andlocked in the first tube 180 so that a desired distance between thevarious masking assemblies 184 is obtained.

This embodiment of the invention employs extension sprayrods 194 havinga transverse connector member 196. The upper end of the connector 196 isconnected to the 'main' spray rod 152. The spray nozzle 176 isthreadably mounted at the lower end of the connector member and fits inthe cup 108. The extension spray rods .194 fit into the sides of theconnector. The main spray rod 152 is adapted to pass liquid into theconnector and thence into the rod 194 and the spray nozzle 176.

The opposite ends of the rod 194 have downwardly extending nozzles 198which each fit in an opening in the masking assembly 184. Liquidintroduced into the rod 194 is thus emitted as a spray through themasking assembly 184.

If desirable, only a single extension masking assembly 184 maybeemployed in addition to the central maskingassembly. A variety ofextension spray rods 194 must be supplied to accommodate the variouspositions of the telescoping tubes 182. It can be seen that the sametype of structure as disclosed herein can easily be adaptedto provideany number of parallel lines, each having its own width.

Whenthe line marking device shown in the above embodiments of theinvention is not to be used for a period of time, the entire device maybe disassembled. This may be easily doneby first pullingthe cotter pins34 and 64, and removing the can from the truck member 10. The spraymember 12 is removed by spreading thearms 72 and 74 and pulling them outof the brackets 38. The entire valved spray assembly 16 and spray member12 are then removed as a unit from the truck member 10.

When the present line marking device is to be used for marking somethingother than lines and the masks are not needed, the valve assembly 154with its rod v152 may be easily pulled out of its clip 168 and off therod 172 and operated manually. The can and spraying assembly can be usedin the same manner for miscellaneous spraying of insecticides or otherliquids.

This invention may be embodied in other forms or carried out in otherways without departing from the spirit or essential characteristicsthereof. The present embodiments of the invention are therefore to beconsidered as in all respects illustrative and not restrictive, thescope of the invention being indicated by the appended claims, and allchanges which come within the meaning and range of equivalency of theclaims are intended to be embraced therein.

I claim:

1. In a line marking device wherein marking liquid is 6 sprayed betweena pair of masks in the form of spaced apart plates, the improvementcomprising (a) a pivotable support for each of said plates adjacent itsupper edge so as to permit pivotal movement of the plate about saidedge,

(b) locking means on said plates adapted to lock said plates in theirdesired pivotal position,

(c) said locking means comprising transversely extending sections onsaid plates overlying one another, each of said sections having aplurality of spaced parallel holes, various angles of inclination ofsaid plates bringing different pairs of said holes in axial alignment,and

a locking pin having locking arms adapted to pass through coaxial holeson said transverse sections and to thereby lock said plates in positionagainst pivotal movement about said supports.

2. A line marking device, comprising (a) a wheeled truck member,

(b) a reservoir of marking fluid supported on said truck member,

-(c) a spray section pivotally supported on said truck member,

(d) a masking device on said spray section including spaced apartsubstantially vertical plates and an opening situated above the spaceenclosed by said plates,

(e) a rigid spray rod having a forward end adapted to fit slidingly insaid opening so as to direct the spray of fluid downward between saidplates, and a rearward end having valve means therein adapted toregulate the flow of fluid therethrough,

(f) flexible hose means connecting said reservoir to the rearward end ofsaid spray rod,

(g) releasable locking means on said spray section,

(h) said locking means permitting pivoting of said spray rod about saidlocking means, and

(i) said spray section including a cleaning well disposed adjacent tosaid opening in said masking device, whereby the forward end of saidspray rod may be removed from said opening, pivoted about said lockingmeans and placed in said cleaning well.

3. A line marking device, comprising (a) a wheeled truck member, -.(b) areservoir of marking fluid truck member,

(0) a spray section pivotably supported on said truck member,

(d) a masking device on said spray section including spaced apartsubstantially vertical plates and an opening situated above the spaceenclosed by said plates,

(e) a spray rod having a forward end adapted to fit slidingly in saidopening so as to direct the spray of fluid downward between said plates,and a rearward end having valve means therein adapted to regulate theflow of fluid therethrough and connected to said reservoir, and

(f) a cleaning well disposed adjacent to said opening in said maskingdevice, whereby the forward end of said spray rod may be removed fromsaid opening and placed in said cleaning well.

4. The device as defined in claim 3 and including (a) a handle structureat the upper end of said truck member, v

(b) actuating means mounted on said truck member adjacent to said handlestructure,

(c) linking means adapted to connect said actuating means to said valvemeans in said spray rod,

(d) whereby actuation of said actuating means actuates said valve meansso as to regulate the flow of fluid through said spray rod.

5. The device as defined in claim 3 and including (a) a handle structureat the upper end of said member, (b) an actuating lever pivotablymounted on said truck member adjacent said handle structure, and

supported on said truck (c) a connecting rod fixed at one end to saidlever and at the other to said valve means in said spray tube,

(d) whereby actuation of said lever actuates said valve means so as toregulate the flow of liquid through said spray rod.

6. A device for marking a line on a surface, comprising (a) an elongatedtruck member,

(b) a transversely projecting platform at the lower end of said member,

(c) at least two wheels supported on said member above and on the sideopposite said platform such that said member is supported on saidplatform when vertically oriented, and is supported on said wheels wheninclined from its vertical position,

(d) a reservoir of marking liquid mounted on said member,

(e) a wheeled spray section hingedly connected to said member,

(f) a conduit means connecting said reservoir liquid to said spraysection, and

(g) valve means regulating the flow of liquid through said conduit meansand spray section.

7. The device as defined in claim 6 and in which said spray section andreservoir are detachably mounted on said truck member, said truckmember, wheels and platform comprising a conventional hand truck afterremoval of said spray section and reservoir.

8. The device as defined in claim 6 and in which said truck member ismovable into at least three positions, including (a) a vertical positionwherein said platform abuts the surface and said wheels are suspendedthereabove,

( b) a first inclined position wherein said wheels abut the surface andsaid platform is disposed thereabove,

(c) a second inclined position wherein said wheels abut the surface andsaid platform supports said spray section off said surface.

9. The device as defined in claim 6 and in which said spray sectioncomprises (a) a fork member adapted to be pivotally connected to saidtruck member substantially midway along the length of said member,

(b) a carriage pivotably mounted at the forward end of said fork member,

(c) masking means in said carriage adapted to mask the liquid passingfrom said conduit means through said spray section,

(d) a wheel in said carriage adapted to support the entire spray sectionabove said surface,

(e) and adjusting means for pivoting said carriage and said lastmentioned wheel so as to alter the radius of curvature of the markedline produced by the device.

10. The device as defined in claim 9 and in which said platform isadapted to support a reserve or supply can of marking liquid, and inwhich said fork member includes a pair of spaced apart forwardlyconverging arms adapted to be pivotably connected to said truck membersubstantially midway along the length of said frame, said arms extendingon opposite sides of said supply can and thereby permitting removal ofsaid can from said device only in the vertical direction.

11. The device as defined in claim 9 and in which said adjusting meanscomprises (a) a threaded opening in said carriage,

(b) a threaded rod engaging said opening and journaled in said forkmember, whereby rotation of said rod produces a pivoting of saidcarriage and a resulting alteration in the radius of curvature of themarked line produced by the device.

12. The device as defined in claim 6 and in which said truck memberincludes clip members adapted to releasably lock said reservoir ofmarking liquid on said truck member.

13. The device as defined in claim 6 and in which said spray sectioncomprises (a) a fork member pivotably connected to said truck member,

('b) at least one center wheel supporting said fork member off saidsurface,

(c) an elongated extension member extending transversely from a pointadjacent said center wheel,

(d) masking means supported at the end of said extension member,

(e) a wheel supporting said extension member and said masking meansadjacent the end thereof, and

(f) second conduit means carrying said liquid from said first conduitmeans and spraying it through said masking means.

14. The device as defined in claim 13 and in which said spray sectionincludes (a) a second masking means adjacent said center wheel, and

(b) third conduit means carrying liquid from saidfirst conduit means andemitting it in the form of a spray through said second masking means.

15. The device as defined in claim 13 and in which said extension membercomprises telescoping members adapted to be locked together selectivelyat a number of points so as to selectively vary the distance betweensaid center wheel and said masking means.

16. A device for marking a line on a surface, comprising (a) anelongated truck member,

(b) a transversely projecting platform at the lower end of said member,

(c) at least two wheels supported on said member above and on the sideopposite said platform such that said member is supported on saidplatform when vertically oriented, and is supported on said wheels wheninclined from its vertical position,

((1) a reservoir of marking liquid mounted on said member above saidwheels,

(e) a spray section hingedly connected to said truck member on the sameside as said platform,

(f) a front wheel in said spray section adapted to support said spraysection off said surface,

(g) conduit means connecting said reservoir liquid to said spraysection,

(h) valve means regulating the flow of liquid through said conduit meansand spray section,

(i) and adjustable means adapted to pivot said front wheel in thehorizontal plane.

17. The device as defined in claim 16 and in which said truck member ismovable into at least three positions, including (a) a vertical positionwherein said platform abuts the surface and said truck member wheels aresuspended thereabove,

(b) a first inclined position wherein said truck member wheels abut thesurface and said platform is disposed thereabove, and

(c) a second inclined position wherein said truck member wheels abut thesurface and said platform supports said spray section and said frontwheel off said surface.

References Cited by the Examiner UNITED STATES PATENTS 1,188,131 6/1916Agee 239- 1,783,689 12/1930 Angier .s 239-450 2,192,433 3/ 1940Cornel-ison 239-150 2,812,211 11/1957 Gardner 239l50 3,023,969 3/1962Hudson et al 239-286 3,050,260 8/1962 Macrae et a1 239-150 3,092,3286/1963 Patterson et al. 239150 EVERETT W. KIRBY, Primary Examiner.

1. IN A LINE MARKING DEVICE WHEREIN MARKING LIQUID IS SPRAYED BETWEEN APAIR OF MASKS IN THE FORM OF SPACED APART PLATES, THE IMPROVEMENTCOMPRISING (A) A PIVOTABLE SUPPORT FOR EACH OF SAID PLATES ADJACENT ITSUPPER EDGE SO AS TO PERMIT PIVOTAL MOVEMENT OF THE PLATE ABOUT SAIDEDGE, (B) LOCKING MEANS ON SAID PLATES ADAPTED TO LOCK SAID PLATES INTHEIR DESIRED PIVOTAL POSITION, (C) SAID LOCKING MEANS COMPRISINGTRANSVERSELY EXTENDING SECTIONS ON SAID PLATES OVERLYING ONE ANOTHER,EACH OF SAID SECTIONS HAVING A PLURALITY OF SPACED PARALLEL HOLES,VARIOUS ANGLES OF INCLINATION OF SAID PLATES BRINGING DIFFERENT PAIRS OFSAID HOLES IN AXIAL ALIGNMENT, AND A LOCKING PIN HAVING LOCKING ARMSADAPTED TO PASS THROUGH COAXIAL HOLES ON SAID TRANSVERSE SECTIONS AND TOTHEREBY LOCK SAID PLATES IN POSITION AGAINST PIVOTAL MOVEMENT ABOUT SAIDSUPPORTS.